Furnace



W. K BOOTH.

FURNACE- APPLICATION FILED DEC13. 1919.

1,41 ,773,. v Patent-ed June 6, 1922,

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w. K.VBOOTH.

FURNACE.

APPLICATI ON FlLED DEC. 3. I919.

1,418,773. Patented June 6, 1922;.

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.5206?! 2 02" fliZa-a ,500 2 UNITED STATES PATENT omen.

WILLIAM "1;. room, or cmcAeo, rumors, ssrouoa 'ro THE BOOTH nmc'rmc 1summer. 00., or CHICAGO, rumors,- A CORPORATION or rumors.

FURNACE.

Specification of Letters Patent. Patented 11113 6 1922 Application filedDecember-3, 1919. Serial No. 342,131,

To all whom it may concern:

' Be it known that 1, WILLIAM BOOTH, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a new. and useful Improvement in Furnaces, of which thefollowing is a specification.

The present invention relates to furnaces for melting metals, and formetallurgical purposes, and more particularly to electric furnaceshaving 0 lindrical bodies;

The primary object is to provide an improved furnace .of this characterhaving special provision for' lining the furnace, and for renewing thelining economically and with facility.

Heretofore it has been the practice to line such furnaces with a largenumber of fireclay bricks} laid in a suitable cement, or mortar. Thisresults in a large number of joints in the furnace, and in the operationof such a'furnace the joints are quickly attacked, leading toquickdeterioration and destruction of the lining. Such a lining isespecially susceptible to quick deterioration when the furnace is usedfor. melting materials which contain lead, or other constituentswhichbecome hi hly fluid when melted; and it is very di cult to make ajoint which will not allow a highly fluid molten'met al to see throughthe joints and collectbaok of the 'nin'g, thereby reducing the'eflicienc of the furnace and tending to nick deterioration of thefurnace These ifliculties' have been recognized, but here 'tofore 3 nopractical method of overcoming I {them has .;been. devised. Ithas beenpro} posed to tamp a lining in position in this type (of furnaceliningthe same, when. necessary, is facili ta'ted by the invention hereindescribed.

' a The but'such ameth'od has not proven' racticable, v w

iflicultiesnoted above are obviated andthc construction of the furnaceand re- The invention is'illustrated in its preferred embodiment in theacompanying 1 represents 'a vertical sectional view of' an 1m Q roved[furnace embodying the invention,-,., ig.2, an outerface view of "one ofmin" employed; andFi ..,3',"-ja sec- I .v '3 tionalTfyiew"-s1 owing amodification "of the molded annular-dining In the; illustration" given,represents a tionsfcf the 1 melted sectional re} a radial extension. 4

cylindrical furnace-body which is equipped with annular supportingtracks A, which encircle and are insulatingly mounted on thefurnace-body and which serve as annular contact members; B, B, representshoes, or contact members, which engage the members A and are suppliedwith current through conductors B fromany suitable electric source(not'shown) C, C, supporting rolls for the furnace-body, which supportthe furnace-body through the medium of annular tracks A, the mechanism Cbeing provided with means (not shown) whereby the furnace-body) may berotated or oscillated on its axis; D, a pair of electrodes which extendthrough the end-walls of the furnace and are carried by electrode clampsD mounted on frames D sup orted on the endwalls of the furnace; and E,flexible electric conductors connecting the annular contact members Awith the electrode clamps In the illustration given, one of theelectrode supporting frames D is carried by the end plate 1, secured toone of the end walls of the furnace-body; and the other electrodesupporting frame is carried by a door 2, which is mounted on the endwall of the furnace and serves as a closure for a charging opening 2* inone of the end-sections of the lining.

As shown in Fig. 1, the lining comprises an .annular body 3 of-moldedrefractory material, such as fireclay, this annular body being in theform'of a complete integral annulus; a pair of molded end-sections 4'and5 which flank the annulus 3 and are composed of suitable refractorymaterial, such as fire- .clay; and a packing of heat insulation endswith outturned flanges 7; and a pair of sheet-metal end-plates 7 whichare detachably secured to the flanges 7? by means of bolts 7.

The molded. end-section 4 of the lining is in the form of a heavy disk,which is provided with a central opening 4* for the electrode. The disk4 is provided on its .outer' surface with a raised portion, orembossment, 4,. wh ch is somewhat in the nature of a hub, this hub beingprovided with The embossment is loo adapted to bear against thesheet-metal endlate 7*, and'the surrounding space is filled y thepacking material 6. The radial extension 4 of the embossment is providedwith a tap-hole 4", which is counter-sunk at its outer end to receivethe reduced inner end of the lining 8 of a discharge spout 9. Thetap-hole is adapted to be closed by a plug of fireclay 10. I

The door 2 is provided with a refractory lining 11, within which isinserted awatercooled sleeve 12. The central perforation through thedisk 4 is provided with a counter-sink which receives a water-cooledsleeve 12 The molded end-section 5 has its outer surface provided with ahub-extension 5%, which bears against the end-plate 7 The surroundingspace is filledwith the insulation packing material 6. The chargingopening 2 extends "through the end-section 5.

In operation, the furnace-body is sup ported and. rotated, oroscillated, through the medium of the rollers C; the annular contactmembers Aare energized throu h the medium of the shoes, or brushes, andthe current passes through the conductors E to the electrode clamps, andthe 'circuit is completed through the electrodes and an are 13 betweenthe inner ends thereof. It will be noted that the principal joints whichare subjected to the direct action of the molten metal in the furnaceare the circumferential joints 14 at what may be termed the. annularcorners of the furnace. Because of their location, these joints have atendency to clo or fill up in the corners of the "furnace, t usprotecting the joints. When it becomes necessary, however, to reline thefurnace, this may readily be effected by removing the right-handend-plate shown in Fig. 1 and substituting a new lining. In putting thelining in place in the first instance, or in renewing the lining, the.packing material 6 may be tamped against the left-hand. end-plate 7 asuitable form being employed, if desired, to retain a space for theembossment, or projection, 4, of the melted end-section 4. It will benoted from Fig. 2 that the embossment is rovided with a bevel ortion 4,which enabl s the molded end-section of the linin to be forced intoproper position with acility. After the end-section 4 is in position,the annular section 3 may be inserted'and the packing material 6 tampedinto the annular space surrounding the section 3. The remainder of thework of lining the furnace may be completed in an-obvious manner.

Fig. 3 illustrates a modification of the molded annular lining body,which may be employed for furnaces of too great len 11 to render itconvenient to make the annu us of one section. Thus, the annulu may becomposed of two annular sections 3 and 3*, one of which has a reducedextension 3 which fits into a corresponding annular recess in the othersection. Thus, preferably, the joint is broken, or off-set, at thejunction plane. Y I

The foregoing detailed description been given for clearness ofunderstanding only, and no unnecessary limitation should be understoodtherefrom, but the appended claims vshould be construed as broadly aspermissible, in view of the prior art.

What I regard as new, and desire to se cure by Letters Patent, is:

1. A furnace-body, comprising an annular metal shell provided with adetachable endplate, and a lining of molded sections of refractorymaterial insertable through the end. of said shell and comprising anannular body having a substantially cylindrical molded integral sectionand a pair of endsections flanking said annular body.

2. A furnace-body, comprising an annular metal shell provided with adetachable endplate, a lining of molded sections of refractory materialinsertable through the end of said shell and comprising an annular bodyhaving a substantially cylindrical molded integral section and a pair ofend-sections flanking said annular body, and a packing of heatinsulation material interposed between said molded sections and saidshell.

3. A furnace body, comprising an annular metal shell provided with adetachable end plate and a lining of molded sections of refractorymaterial insertable through the end of said shell and comprising anannular body having a substantially cylindrical molded integral sectionand a pair of end sections flanking said annular body, said end-sectionshaving hub-portions bearing against the end-plates of the metal shell,and a packing of heat insulation material interposed between said moldedsections and said shell.

4. A furnace-body, comprising an annular metal shell provided withdetachable'endplates and a lining of molded sections of refractorymaterial insertable. through the end of said shell and comprising anannular body having a substantially cylindrical molded integral sectionand a pair of endsections flanking said annular body, said end-sectionshaving their outer 1 surfaces provided with hub-extensions and havingopeiings through which electrodes may exten 5. A furnace-body.comprising an annular metal shell provided with detachable endplates anda lining of molded sections of refractory material insertable throughthe end of said shell and comprising an annular body having asubstantially cylindrical section and a pair of end-sections flankingsaid annular body, one of said end-sections having its outer surfaceequipped with a hubportion and a radial extension with a tapopeningextending therethrough, and a spout applied to the corresponding end ofthe furnace and having a refractory lining provided with an extensionfitted into a counter-sink at the outer end of said tap-hole.

6. A furnace lining, comprising an annular body which includes a moldedcylindrical integral section and a pair of molded end-sections flankingsaid annular body.

7. A furnace lining, comprising an in-- tegral molded annular section ofrefractory material and a pair of molded end-sections of refractorymaterial flanking said annular body.

' 8. A furnace lining, comprising a plurality of abutting moldedintegral annular sections of refractory material and a pair of moldedend-sections of refractory material flanking said annular body andproyided with-central openings through Which electrodes may extend.

- WILLIAM K. BOOTH.

